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Can't place ceiling tiles in certain spots, even with foundation/pillar support
I was playing the new Extinction Map, and I decided based on some videos I watched on youtube to build my base in the city on top of a building. The one I picked has a few natural inclines that take you from one lower level up higher to another higher level, so I decided to make use of this. Unfortunately when trying to build the upper level out over the top of the lower level, there are certain spots that the game will not let me place the ceiling tile down it just says "Can't Place Stone Ceiling: Requires Nearby Foundation Support." It does this even if I give all other surrounding ceiling tiles support with pillars, it still will not let me place the tile. It's very aggravating and I don't know what to do.
I'm attaching Images to show you what I'm talking about.